So we know Sazed didn't want people to know about and use Hemalurgy, since he excluded it from the words of founding. Why, then, did he keep it? Why not just remove that magic system all together? If he had to leave it in for balance or something, he could have changed the way it worked to make it impossible to use. Make it so only atium can be used for hemalurgic spikes, then put all the atium deep underground on another planet. He could give the koloss, kandra, and Marsh atium spikes of he wanted to keep them around. I don't get it.